Answer:
33 minutes
Explanation:
The principle of progression suggests that overload must be increased using frequency, intensity, time and type, when your present routine of exercise is no more felt by your body. Hence since Sally is jogging three times per week for 30 minutes, she could either increase it to jogging same 3 times a week, but instead increase her time by a factor of three to 33 minutes.
The reason the student is reading. :)
If your goal is to find a mentor who can help encourage you the category that it would fall under would probably be Academic